Piston-valve.



J. A. HEANY.

PISTON VALVE.

APPLICATION FILED APR. I6, 190s.

960,91 2. Patented June 7, 1910.

'srarns PATENT@ OFFICE.

Jin-INv ALLEN HEANY, OFM-YORK, PENNSYLVANIA -As'sIGNoR 'To THE COMPANY, 'OFVNEW YORK, NEL, e; coRroRATIoN 'oF MA1N E VP'I'srorrfvnaL-vn.

To dll whom-it may concern: Be it known that I, JOHN ALLEN HEANY,

l' a citizen of the United States,- residing at l York,

in the county of York and StateA of Pennsylvania,

. and useful Improvements in Piston-Valves,

of which the following is a. specification.

This invention relates to `a piston valve particularly adapted for use in a vacuum system, lsuch as is usedfor exhausting incandescent lamp bulbs, and'has for its ob ject the production of a valve, absolutely .preve t leakage .of air into the system. f

Referring to -the accompanying drawings :Figure 1 is al sectional elevation of the valve; and Fig. 2 i's a plan view.

As shown in the drawings 2 is a casing within which is contained av piston -valve 3.

At the lower end of this casing is an accurately fitted flanged plug 4, secured to the casing by asoldered joint 45.l Extending through the plug and an upwa/ rd extension 6 thereof is a passage 7. Screwed into a registering opening in the bottomot' the plug is a pipe S, also having a soldered joint 9, by

which leakage is prevented at that point.

Surrounding the extension 6, is an annular' recess 14. to such a distance that passage ot" air through the conduit t is, m 'closing the valve, cut oti' slightly in advance ofthe e11-4 gagcment o the lower edge of the valve with the mercury 16. By this arrangement of parts, the mercury. 16, placed in the bottom of the valve chamber lis prevented from being blown or carried over into `the passage T.

The mercury inthe chamber is of such depth that when the piston-valve is fully closed, it will rise above the plane of `the meeting parts, and thus afford an additional seal.

' 18, which 21, through which have invented certain lnew' which will. vmeans, the top coperate with an annular vlower valve-cham The piston-valve is carriedby a piston-rod.

.operated by means of a lever 19, having-a handle '20, having therein a'slot passes a'curved arm 22,

pivoted to the` top plate 23, and normally www Lettefsfafehtf 'Patent-,adulte '7, 1910. Application med April 16, 1,999. Serial Nm'iigmgegh j pressed outwardly by the spring 24. The

arm 22 has a finger-piece 220 and a lug 25 ladapted to enga e-with either the top or bottom face-oia t e arm 2O and thus hold the valve open or shut.

To the top of-the casing 2. is screwed a cap 30 to which are secured by any-desired plate 23, and the block 31, in which'is mountedV the spring 2 4, and. which is provided with a' handle 32, c omplementary to the handle 20. The upper en d of the main valve chamber 17, is closed bya stutling-box 33, screwed into the casing. 2, and hai-'mg an external screw thread 35 and ange'3l provided with holes 36 to receive -a 'suitable wrench. Surrounding the vpiston-rod is :a suitable. packing 3T, such as wiclrinfr soaked' in hot tallow, which is compressed by means-'of a ring 3S, which is in turnheld down by an externally screwthreaded hollow shell 39, which is screwed down through the top-plate 23 and cap 30, its inner-Shore :forming a guide for the piston-rod.

, The chambers 40, 41, formed in the upper part'ofthe casing and within i the shell 39 colnmunicate by means of openings 42 and lare dllilled .with mercury to the level` indicate chamberfto be exhausted. V

Supporting bands 50 are arranged to'suitably support the valve mechanism.'`

6 0 is an openingthrough whieh'mer'cury ma be introduced into the up er' chamber..

t will be noted'that the stu Tg-box constitutes adia'phragm for dividing the hollow easing into any up )er sealing-chamber, and 'a er, in each of which isf An inlet pipe 43 leads to the bulbs or other provided a mercury seal, in addition' to the "i other devices, which are Iin themselves adapt-.

ed to form'air-tight closures at the necessaryl points. i

'I claim:v t

1. 'A valve mechanism comprisinga hollow casing having formed thcreln a chamber' provided with inlet and exit openings,fa. valve seat anda valve engagmg'there, closure for such chamber Vprovided@ w packing device foi-the' valve rod, -acap-f.

the caslng -tnrough which the valve rod passes and m'ercuryse'als in the valve chamer and about the yalve rod. v

"2, 'A valve devoecomprisng a hollow casing divded'b'y a stuffing-box into two closed chambers, a valve in the lower chamber, and :i valve rod extending through'- the 'stuffingbo'x'and upper hamber, said upper chamber fui being adapted to receive a mercuryseah 104 ing divided by-a stung-box into two closedf` i' 3. A valVede'Vee comprising a. hollow ons chambersya v-lye in the lowenchamber, i1-u rod extendingthrongh t'l1e.stuffngbox and.

upper chamber,. and -zrmerclu'y seal in each- 'chamberz 4; A valve mechanism Comprising a v alve andfits coperatng seat, anda suipplementl closmg devflcearrled bythe valve and arranged to `eect 'a closure in advance of that 2() efected'by-the valve.

Q5. A casing havinga' chamber therein, a valvefseat therein, "si eoperating valve, an, upwardlyY extending conduit-,1a closure for -said conduit arred by the valve, the parts 25 being so proportioned that'the closure is effee-ted before the Valve reaches its seat.

6.In an, air valve mechanism, a casing having-achamber therem, an exlt openlng in'tle bottom thereof, an annular valve-sean surrounding said opening, an annular cham- .bered valve and packing arrangedt operate-`with the seat, a tube extend-1 'Wardly from the opening into the fmber,

closing the tube.

7; A valve cnsmg havlng 'an up fn'gfbox scr'enednt'o the 'upper end of the lonffler fchamber, v'anfnpertured hollow .shellsc'eyv'ed vinto and' through the top of the up- .pel-z-chnnlber nndennaging'the stung box,

rod and located in said lower chznnber.

8. A Valve'casing, :i piston valve therein, a vakje rod, an operating lever connected to the yalvero'd, nd "a spring pressed catch erm, n'rrangedto engage the lever and hold andfa valve rOdpnSSng through the shell and stufhng-box, and a vulve carried by sind the valve in either' its open or closed position.. 

